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Once Fusion Guide

Plan deviation fusions, compare possible outcomes, and keep useful results close while you experiment and optimize your builds.

Open Fusion Simulator Browse Database

Game Updates & Events

Patch Notes Latest

Console Issue Fix Progress Notice

The development team has released a progress update regarding ongoing fixes for console controls, display, and audio issues. They sincerely apologized to players for the initial launch inconveniences.

Patch Notes Latest

Console Bug Fixes Aug 26

A new hotfix has been deployed to resolve several issues on the console version of the game. This update specifically targets and resolves various Xbox-related bugs.

Community Latest

Console Version Issue Notice

An official notice was published acknowledging receipt of numerous bug reports from console players post-launch. The team apologized to all affected Metas and promised swift resolutions.

Live Site Metrics

Total Deviations: 64

Simulated Fusions: 0

Newest Species: Wish Box

Core Platform Features

Outcome Predictor

Input your current Deviations and level configs to view the calculated likelihood of trait transfer. Make informed decisions before spending in-game resources.

Comprehensive DB

Browse extensive tables of Deviations, Traits, Skills, and Mutagens. Filter by role (Combat, Territory). The Database is not 100% accurate due to game updates.

Inventory Sync

Save your current Deviation items and traits locally to retrieve them instantly in the simulator, helping you track your fusion backlog seamlessly.

Once Human Deviation Fusion Guide

What is Deviation Fusion?

In Once Human, Deviations are companion entities that assist in combat or maintain player territory. Deviation Fusion is a system that allows players to combine two deviations (Parent A and Parent B) or with the use of species mutagens. The resulting offspring inherits traits, gains levels depending on the parents levels.

Understanding Traits & Inheritances

Every deviation contains trait slots (such as combat traits, general traits,territory traits and others). Traits are inherited with varying probabilities.

How to Optimize Your Fusions

Select Mutagens Wisely: Different mutagens can give different deviation/skill outcomes.
Parent Levels: I am still working for the parent skill rating and level ratings for now.
Simulate Before Fusing: Use the Fusion Simulator to check the success probabilities before locking in your choice. This helps users to see outcomes without losing their deviations accidentally in the game.